Re: [Geotools-gt2-users] feature saving and appending

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Thanks Chris for your advices!!! 
If I understood, I should use the addFeatures , so we could have such a
code : 
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; FeatureStore featureStore = (FeatureStore)
datastore.getFeatureSource("road"); 
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; FeatureReader aReader =
datastore.getFeatureReader(aQuery,featureStore.getTransaction()); 
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; featureStore. addFeatures( aReader); 
 
could you indiacte me which kind&nbsp; of Query I've to put in this
expression? (the minimal one) 
Thanks 
Xavier 
 
 
Chris Holmes a &eacute;crit&nbsp;:
<blockquote
 cite="mid...@be..."
 type="cite">
 <pre wrap="">FeatureWriters are meant to be low level access, and indeed we are 
thinking of deprecating them. To add a feature you should just get a 
FeatureStore (shapefile implements it), and call addFeatures. Note that 
this may not work if your on a windows ntfs file system, as it sometimes 
has trouble with nio I believe.

Chris

On Tue, 30 Nov 2004, Xavier M&eacute;haut wrote:

  </pre>
  <blockquote type="cite">
    <pre wrap="">Hello,
I've write the following simple&nbsp; code below to save a feature and then
reopen it to add a new feature to the file.
It almost runs, except for the appending.
Does someone could help me?
regards
Xavier

________________________________________________________________________________

public class EssaisWriter {
&nbsp;&nbsp;&nbsp; private static String URI = "C:/Documents andSettings/utilisateur/Bureau/eclipse/workspace/DecouverteGeotools/data/essai.shp
;

&nbsp;&nbsp;&nbsp; public static void main(String[] args) throws IOException,
ParseException,
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; IllegalAttributeException, FactoryConfigurationError,
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; SchemaException {
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; saveFeatures();
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; appendFeature();
&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp; // /////////////////////////////////////////////////
&nbsp;&nbsp;&nbsp; // save shapefile
&nbsp;&nbsp;&nbsp; // /////////////////////////////////////////////////
&nbsp;&nbsp;&nbsp; public static void saveFeatures() throws FactoryConfigurationError,
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; SchemaException, ParseException, IllegalAttributeException,
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; IOException {
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; // feature : creation du type
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; AttributeType geom =
AttributeTypeFactory.newAttributeType("the_geom",
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; LineString.class);
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; AttributeType roadWidth = AttributeTypeFactory.newAttributeType(
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; "width", Float.class);
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; FeatureType ftRoad = FeatureTypeFactory.newFeatureType(
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; new AttributeType[] { geom, roadWidth }, "road");

&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; // feature : creation de l'instance
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; WKTReader wktReader = new WKTReader();
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; LineString geometry = (LineString) wktReader
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; .read("LINESTRING (0 0, 10 10)");
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; Float width = new Float(10);
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; Feature theRoad = ftRoad.create(new Object[] { geometry, width },
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; "myRoad");

&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; // creation du datastore
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; URL anURL = (new File(URI)).toURL();
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; ShapefileDataStore datastore = new ShapefileDataStore(anURL);
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; datastore.createSchema(ftRoad);

&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; // sauvegarde du fichier
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; FeatureWriter aWriter = datastore.getFeatureWriter("road",
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; ((FeatureStore) datastore.getFeatureSource("road"))
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; .getTransaction());
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; Feature aNewFeature = aWriter.next();
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; aNewFeature.setAttributes(new Object[] { geometry, width });
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; aWriter.write();
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; aWriter.close();
&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp; // /////////////////////////////////////////////////
&nbsp;&nbsp;&nbsp; // appendFeature
&nbsp;&nbsp;&nbsp; // /////////////////////////////////////////////////

&nbsp;&nbsp;&nbsp; public static void appendFeature() throws IOException,
ParseException,
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; IllegalAttributeException, FactoryConfigurationError,
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; SchemaException {

&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; // feature : creation des attributs de l'instance
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; WKTReader wktReader = new WKTReader();
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; LineString geometry = (LineString) wktReader
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; .read("LINESTRING (10 10, 20 20)");
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; Float width = new Float(10);

&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; //on recupere la feature
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; URL anURL = (new File(URI)).toURL();
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; ShapefileDataStore datastore = new ShapefileDataStore(anURL);
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; String featureName = datastore.getTypeNames()[0]; //road"
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; FeatureSource source = datastore.getFeatureSource(featureName);

&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; // append feature
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; FeatureWriter aWriter =
datastore.getFeatureWriterAppend(featureName,
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; ((FeatureStore) source).getTransaction());
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; Feature f = aWriter.next();
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; f.setAttributes(new Object[] { geometry, width });
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; aWriter.write();
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; aWriter.close();
&nbsp;&nbsp;&nbsp; }

}

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Re: [Geotools-gt2-users] feature saving and appending

Toolkit for working with and mapping geospatial data

Re: [Geotools-gt2-users] feature saving and appending